Ed and Lorraine Warren are a husband and wife team who investigate paranormal activity. Their most famous case is probably the Amityville horror. The reliability of their research is considered ques- tionable by many. The Warrens currently make a living by travelling the lecture circuit and releasing the occasional book.
You can visit their website (The New England Society for Psychic Reasearch) at http://www.warrens.net/.
This page (http://www.ghosts.org/faq/5-5.html) last updated April 13, 2005.